This protocol tracks the state of the incident links,
and maintains routes to immediately adjacent neighbors only.
As with the other protocols, it maintains instance variable arrays
of nextHop_, rtpref_, and metric_, indexed by
the handle of each of the possible destinations in the topology.
The instance procedure
computes routes based on the current state of the link, and the previously
known state of the incident links.
No other procedures or instance procedures are defined for this protocol.